Call us


We're Available

Mon - Fri: 8:30 - 5:00 CST

Indirect Gas-Fired Make-Up Air Unit

An indoor space can receive clean air thanks to the modular indirect gas-fired heater (IGF). They can be installed indoors or outdoors and can run on either natural or LP gas. Combustion fumes won’t penetrate the fresh air stream thanks to the push-through architecture.

Since the burner is fired into a heat exchanger first, byproducts are contained within that isolated chamber and then exhausted through the flue. Therefore, a flame never directly comes in contact with fresh outside air that enters the space.

heat recirculating indirect gas fired make up air unit

Table of Contents

Authorized Indirect Gas-Fired MUA Suppliers

We are the authorized distributors for the leading American manufacturers of indirect gas-fired make-up air units. We’ll be pleased to provide the ideal make up air unit for your application as authorized representatives.

For a fast quote or if you have inquiries about commercial or industrial MUA, get in touch with us.

Advantages of Indirect Gas-Fired Make-Up Unit


IGF Features

IDGF MUA are highly configurable and flexible. There are VAV options and recirculation features available that allow 100% outside air and constant volume.

Indirect Gas-Fired MUA Applications

When indoor air quality is a high priority then an IGF MUA is required. Other uses are when a direct gas fired unit is not approved for use. 

Typical applications include, but not limited to:

  • Chemical manufacturing facilities
  • Pharmaceutical manufacturing facilities
  • Clean rooms
  • Laboratories
  • Education Facilities
  • Healthcare Industry
  • Sports Industry
  • Semiconductor Manufacturing (Foundries)
  • Convention Centers

The American Gas Association and the Canadian Gas Association have certified and approved the type-409 stainless steel construction of all duct furnaces.


Untempered Make-Up Air Unit An untempered make-up air unit is a fan box that provides ventilation to buildings. It works by providing fresh, outside air

Read More »
rooftop make up air unit cover
Rooftop Unit

Rooftop Mounted Make-Up Air Unit A rooftop-mounted make-up air unit (also referred to as an RTU) is a self-contained DX cooling air conditioner that is

Read More »